When I went (with Transat) we did a split: 3 nights Havana, 4 nights Varadero. If that's an option for you, I'd recommend it. Take a tour the first day, explore at your own pace the second. It's reasonably safe in the tourist areas... Cuba knows that tourism is it's lifeblood, so the penalties for harming toursits are big enough to be huge deterrents. Communism probably helps too.
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